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Mirrors > Home > MPE Home > Th. List > recgt1i | Structured version Visualization version GIF version |
Description: The reciprocal of a number greater than 1 is positive and less than 1. (Contributed by NM, 23-Feb-2005.) |
Ref | Expression |
---|---|
recgt1i | ⊢ ((𝐴 ∈ ℝ ∧ 1 < 𝐴) → (0 < (1 / 𝐴) ∧ (1 / 𝐴) < 1)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 0lt1 10897 | . . . . 5 ⊢ 0 < 1 | |
2 | 0re 10378 | . . . . . 6 ⊢ 0 ∈ ℝ | |
3 | 1re 10376 | . . . . . 6 ⊢ 1 ∈ ℝ | |
4 | lttr 10453 | . . . . . 6 ⊢ ((0 ∈ ℝ ∧ 1 ∈ ℝ ∧ 𝐴 ∈ ℝ) → ((0 < 1 ∧ 1 < 𝐴) → 0 < 𝐴)) | |
5 | 2, 3, 4 | mp3an12 1524 | . . . . 5 ⊢ (𝐴 ∈ ℝ → ((0 < 1 ∧ 1 < 𝐴) → 0 < 𝐴)) |
6 | 1, 5 | mpani 686 | . . . 4 ⊢ (𝐴 ∈ ℝ → (1 < 𝐴 → 0 < 𝐴)) |
7 | 6 | imdistani 564 | . . 3 ⊢ ((𝐴 ∈ ℝ ∧ 1 < 𝐴) → (𝐴 ∈ ℝ ∧ 0 < 𝐴)) |
8 | recgt0 11221 | . . 3 ⊢ ((𝐴 ∈ ℝ ∧ 0 < 𝐴) → 0 < (1 / 𝐴)) | |
9 | 7, 8 | syl 17 | . 2 ⊢ ((𝐴 ∈ ℝ ∧ 1 < 𝐴) → 0 < (1 / 𝐴)) |
10 | recgt1 11273 | . . . 4 ⊢ ((𝐴 ∈ ℝ ∧ 0 < 𝐴) → (1 < 𝐴 ↔ (1 / 𝐴) < 1)) | |
11 | 10 | biimpa 470 | . . 3 ⊢ (((𝐴 ∈ ℝ ∧ 0 < 𝐴) ∧ 1 < 𝐴) → (1 / 𝐴) < 1) |
12 | 7, 11 | sylancom 582 | . 2 ⊢ ((𝐴 ∈ ℝ ∧ 1 < 𝐴) → (1 / 𝐴) < 1) |
13 | 9, 12 | jca 507 | 1 ⊢ ((𝐴 ∈ ℝ ∧ 1 < 𝐴) → (0 < (1 / 𝐴) ∧ (1 / 𝐴) < 1)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 386 ∈ wcel 2107 class class class wbr 4886 (class class class)co 6922 ℝcr 10271 0cc0 10272 1c1 10273 < clt 10411 / cdiv 11032 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1839 ax-4 1853 ax-5 1953 ax-6 2021 ax-7 2055 ax-8 2109 ax-9 2116 ax-10 2135 ax-11 2150 ax-12 2163 ax-13 2334 ax-ext 2754 ax-sep 5017 ax-nul 5025 ax-pow 5077 ax-pr 5138 ax-un 7226 ax-resscn 10329 ax-1cn 10330 ax-icn 10331 ax-addcl 10332 ax-addrcl 10333 ax-mulcl 10334 ax-mulrcl 10335 ax-mulcom 10336 ax-addass 10337 ax-mulass 10338 ax-distr 10339 ax-i2m1 10340 ax-1ne0 10341 ax-1rid 10342 ax-rnegex 10343 ax-rrecex 10344 ax-cnre 10345 ax-pre-lttri 10346 ax-pre-lttrn 10347 ax-pre-ltadd 10348 ax-pre-mulgt0 10349 |
This theorem depends on definitions: df-bi 199 df-an 387 df-or 837 df-3or 1072 df-3an 1073 df-tru 1605 df-ex 1824 df-nf 1828 df-sb 2012 df-mo 2551 df-eu 2587 df-clab 2764 df-cleq 2770 df-clel 2774 df-nfc 2921 df-ne 2970 df-nel 3076 df-ral 3095 df-rex 3096 df-reu 3097 df-rmo 3098 df-rab 3099 df-v 3400 df-sbc 3653 df-csb 3752 df-dif 3795 df-un 3797 df-in 3799 df-ss 3806 df-nul 4142 df-if 4308 df-pw 4381 df-sn 4399 df-pr 4401 df-op 4405 df-uni 4672 df-br 4887 df-opab 4949 df-mpt 4966 df-id 5261 df-po 5274 df-so 5275 df-xp 5361 df-rel 5362 df-cnv 5363 df-co 5364 df-dm 5365 df-rn 5366 df-res 5367 df-ima 5368 df-iota 6099 df-fun 6137 df-fn 6138 df-f 6139 df-f1 6140 df-fo 6141 df-f1o 6142 df-fv 6143 df-riota 6883 df-ov 6925 df-oprab 6926 df-mpt2 6927 df-er 8026 df-en 8242 df-dom 8243 df-sdom 8244 df-pnf 10413 df-mnf 10414 df-xr 10415 df-ltxr 10416 df-le 10417 df-sub 10608 df-neg 10609 df-div 11033 |
This theorem is referenced by: recnz 11804 xov1plusxeqvd 12635 log2tlbnd 25124 padicabvf 25772 rtprmirr 38172 stoweidlem34 41178 eenglngeehlnmlem2 43474 |
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